Egos (Ancient Greek: Α ἰ γεύς）， He is the king of Athens in Greek mythology and the father of Theseus, the hero of Attica.

According to mythology, Egos was the son of King Pandion of Athens and the grandson of Ceylopus. Pandion was ousted from the throne by several sons of his own tribe, including Opalamus, Sikuon, and Daedalus, and was forced to flee to Meghala, where he married the daughter of the local king Pyrrhus, Piria. Pilia gave birth to four sons for Pandion: Aegus, Paras, Nisos, and Lucius. After Pandion's death, Aegis and his three brothers marched into Athens and regained power from the sons of Matteo. Afterwards, the four brothers shared power, but Egos was appointed as the king. Another theory is that the one who usurped the power of Athens was the half human, half beast monster Petus, and Aegus was the one who recaptured Athens from Petus.

Androgus, the son of King Minos of Crete, defeated Egos in all events to win the Pan Athenian Games in Athens. Egos was extremely jealous, so he ordered Androgus to go and capture the harmful beast Marathon bison that ravaged the area near Athens. However, Androgus was killed by the bison instead. [2] Minos was enraged and launched a campaign against Athens, defeating the Athenians greatly. Egos was forced to make peace and promised to pay tribute to Crete seven pairs of boys and girls every year (say every nine years) for the consumption of the monster Minotaurus (born to the Marathon Bison and the wife of Minos, Pasifah).

On the other hand, due to offending the goddess Aphrodite, neither of Egos' two wives (the first being Motta and the second being Karcaopos) were able to give him a child. Egos, who suffered from the lack of male offspring, went to consult the oracle of Delphi and received the answer, "Even if you see the best person, you cannot untie the mouth of the wine bag until you reach the highest point in Athens, otherwise you will die in sorrow. [3] Egos did not understand what this oracle meant. He returned to Athens through Tro and was warmly received by the local king Pitus. Bitus understood the enigmatic oracle (that Egus would have a great son on his way back to Athens, but this son would lead to his death), and he managed to intoxicate Egus and introduce him to his daughter Etra. Egos had a relationship with Etra while intoxicated, causing her to become pregnant and later gave birth to Theseus. Some myths say that on the same night, Athena sent Etra on a sleepwalk to the island of Scyria, and as a result, the sea god Poseidon suddenly appeared and took possession of Etra. Therefore, Theseus may also be the son of Poseidon.

After Etra became pregnant, Egos decided to return to Athens. Before leaving, he pressed his sandals, shield, and sword under a large stone. Egus told Etra that their son should go and retrieve the weapon under the boulder when he grows up, which can be considered a test he left for his son. After returning to Athens, Egos married Medea, who had just left Isazon and fled from Corinth to Athens. Medea promised Egos that she would definitely have a son for him, and the result came true. The son born to Egos and Medea was Medus.

Theseus gradually grew into a brave young man at Tro. He successfully moved the boulder and took out his father's weapon. Etra then told his father's identity and asked him to bring those weapons to Athens to surrender to his father. Theseus arrived in Athens after a series of adventures, on the 8th day of the Hundred Ox Festival. Theseus did not immediately disclose his identity after arriving in Athens. Aegis received him with suspicion, while Medea relied on witchcraft to understand that this young man was Aegis' son. In order to maintain her son's position, Medea attempted to kill Theseus. She first encouraged Egos to send Theseus to hunt and kill the marathon bison, but Theseus successfully completed this task.

Medea attempted to poison Theseus again, but at the last moment Egos recognized that Theseus was wearing his own sword and struck down the poisoned wine cup held by Theseus. After the father and son met, Medea was forced to flee with Medos to Corcas. [4] At this time, Egos' throne in Athens was not stable. His brother Palas' 50 sons attempted to seize his power, spreading rumors that he was only Pandion's adopted son. After Aegeus declared Theseus his own son and heir to the throne, the sons of Palas jumped out to oppose and fought against Theseus, all of whom were eliminated.
Later, Theseus decided to go to Crete to kill Minotaur and lift the terrible tribute for Athens. Before leaving, Egos and Theseus agreed that if Theseus successfully killed the monster, he would change to a white sail on the ship when returning (Theseus' ship had a black sail at the time of departure). Theseus successfully killed Minotaur, but forgot about this agreement with his father. Egos, who was looking forward to his son by the sea, saw that the returning ship was still hanging black sails and mistakenly thought that his son had died. He jumped into the sea in sorrow and committed suicide. In this way, Egos' life fulfilled the oracle. [5] The sea thrown by Aegean is therefore named the Aegean Sea (meaning "Aegean Sea").